Goguryeo is a dynasty of ancient Korea which was begun by Jumong (주몽朱蒙) in 37 BC. It was started in the area near the Dongga River, a branch of the Abrok River.Jolbon was the capital city founded by Jumong.
The legend of the nation's birth is that Jumong was born out of an egg and brought up by King Gumwa (금와왕) of East Buyeo. The name, Jumong, means a person who is good at archery. Because of his archery skills, Prince Daeso (대소왕자) envied him. So, Jumong felt death threats and decided to escape from East Buyeo with three friends. He went to Jolbon Buyeo and married Sosuno (소서노) who was the princess of the nation. Jumong succeeded the king and changed the nation's name to Goguryeo after his surname.